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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by '73 K5, Nov 22, 2001.

  1. '73 K5

    '73 K5 1/2 ton status

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    To gain the 10 or 15 horsepower that the catalogs claim, I'm going to ditch my clutched fan and put some electric ones on the Blazer. When I look at the fans in Summit or Jegs they usually say "good for a V8 up to 280 horsepower" or 300 horsepower. They don't really say much for power above that. Problem is, I'm building my motor up pretty much exactly like a crate motor that dyno'd at 380 horsepower. How many CFM's do I need for something like that? What set up have you guys done?

    '73 K5
    Chevy good...Ford bad
     
  2. BurbinOR

    BurbinOR 3/4 ton status

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    Not sure of the CFM needed, but I run a stock IROC electric fan off a '90 IROC that cools my 406 SBC just fine.............it is aided by the fact that I also have a 4 core radiator. Never gets over 210 degrees even towing in summer heat.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  3. DesertDueler

    DesertDueler 1/2 ton status

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    Dont use any of those black magic crap fans. Use either the iroc fan or use a super coupe fan from a 90 ford thunderbird super coupe. Thats what I use in the bird and it never gets over 210 in the heat of the summer here and thats on low speed. I havent hooked up the high speed yet, just havent had time. Its a single fan with two speed its an awsome fan. I did the fan with an electric water pump and picked up 19.8 rear wheel hp.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  4. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    Iv got a flexalite black magic 150 and I think Burt4x4 has the same one on his rig.It works great .I dont know how many cfm though.It has an adjustable thermastat and an integral shroud

    Some people shouldnt drive anything bigger than their head.<a target="_blank" href=http://community.webshots.com/user/beaterwhang>community.webshots.com/user/beaterwhang</a>
     
  5. Pure Insanity

    Pure Insanity 1/2 ton status

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    I use the same fan as DD in my Blazer. Mine is out of a regular V8 T-bird. Has 2 speeds. Low is impressive, High will suck small children into the grille as they walk past. LOL! I have it on Low for now but will wire it up for high when I get the A/C fixed next spring. To go into high when the A/C is turned on.

    If ya can't stop.......Smile as you go under! &lt;img src="http://coloradok5.com/forums/images/icons/smile.gif"&gt;
    PIC of mine from flblazers site&lt;a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html&gt;
    GO&lt;/a&gt;<P ID="edit"><FONT class="small">Edited by pureinsanity on 11/22/01 07:11 PM.</FONT></P>
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    Its funny how you dont need it but its there if needed.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. Pure Insanity

    Pure Insanity 1/2 ton status

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    High speed absolutly flies! [​IMG]

    I will wire it up w/ the A/C clutch to come into high when the compressor turns on.

    If ya can't stop.......Smile as you go under! [​IMG]
    PIC of mine from flblazers site<a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html>
    GO</a>
     
  8. greg83k5

    greg83k5 1/2 ton status

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    i just parted out an '86 Z28, the electric fan i got has a pseudo-shroud, i'm gonna kinda integrate it into my existing shroud, or is that unnecessary???


    greg
     
  9. Pure Insanity

    Pure Insanity 1/2 ton status

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    Thats a good question. I am not sure. I would try to install it and see how it does near home. If it gets too hot build something. The front of a K5 is huge and alot of air just moves thru when driving. The 1 that DD and I are talking about is a single, I'll guess and say 16-18 " fan. The shroud is not quite as wide as the radiator, but covers plenty of area. Maybe 2 " on both sides are uncovered.

    If ya can't stop.......Smile as you go under! [​IMG]
    PIC of mine from flblazers site<a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html>
    GO</a>
     
  10. newyorkin

    newyorkin 1 ton status

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    I'm looking to do the same thing, and that T-bird setup with the high wired to the AC clutch sounds pretty cool. I gotta remember to look for one tomorrow on my junkyard trek...
    I have an electric behind the grill blowing into the rad right now as a supplement to the clutch fan, just for summer with the AC on. I want to go full electric, but I want to get the second alternator and battery installed first... I've always heard the IROC fans are definately the ways to go for our trucks, too, but that Ford fan sounds interesting too.
    BTW, the supplemental I run is from an '88 Nova, fits between the grill and the rad support on one side like a glove.

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    Welcome to America.
     
  11. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    You can install 2 of them side by side by removing the fan shroud and using the zip ties they come with to mount them directly to the radiator. OR I have seen 4 of them, two used as pullers and 2 as pushers. I dont know how effective that set up is, but I have seen it done...
     
  12. DesertDueler

    DesertDueler 1/2 ton status

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    Dont do the 4 fan thing. It creates a wash because they wont pull and pull at the same cfm so it doesnt work as well. It will work where its cooler out but you will find out that you have to have your cooling system top notch here in AZ during the summer. 1 T-Bird fan works fine.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  13. lasvegas

    lasvegas 1/2 ton status

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    I am doing my motor build up (zz4 crate) and I wanted to do an electric fan to make more space under the hood and show off the March pulleys. I put in the four row radiator from a suburban. I called Perma-Cool to order a fan and the sales guy said to forget it. He told me it would not work with a four row radiator because the raditor was too thick and the fan cannot pull the necessary air through the radiator. He said to stick with the clutch fan. He said he would only recommend using an electric fan on a two row raditor or an aluminum radiator. So I saved the $500.00 I budgeted for that conversion and used it for a custom aluminum fan shroud and raditor bracket instread.
     
  14. wayne

    wayne 3/4 ton status

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    How about a write up on it since it sounds like some good info to use the Bird fan.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  15. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    lasvegas Frank(blazinor) has a 4 core radiator with a 406 tpi in his and he has had no problems running an electric fan with his so i would say they are blowing smoke up your ars in my opinion lol

    wheeling videoshttp://community.webshots.com/user/ssmith6333
     
  16. Pure Insanity

    Pure Insanity 1/2 ton status

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    Theres really not much to tell. I had a T-bird come in the shop, I tore it down for inspection and the car totaled. I had the fan in a pile of busted up parts when the car got picked up. I didnt even know it totaled. When cleaning up the mess I found the fan. [​IMG] I found the correct plug in for it from an old wiring harness. I fabbed up some brackets from 1X1/8 strap in a few min that run from the top of the rad. support, to the bottom. Just a few bends, and 1 kwik weld. Pretty much it. It fits good, works great and was free to boot! [​IMG] I will try to get some pics of the brackts I made and post them. That will mean I will need to make a site or at least a photo album. [​IMG]

    If ya can't stop.......Smile as you go under! [​IMG]
    PIC of mine from flblazers site<a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html>
    GO</a>
     
  17. BobK

    BobK 1/2 ton status

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    Here is a link to pic's I took during the install of my electric fans.I've got a mild SBC350(375h/p)with G.M. TPI installed.I ditched my clutch fan and went with two 14" Perma-Cool fans.I made my own aluminium shroud.No prob. with heat.Can't give you an exaxct number but the highest it goes with only 1 fan on is 2 needle widths past the 1st line on the gauge.The 2nd fan is wired to the A/C and a overide switch so it can be turned on and off at will.I'm very happy with my fans.Here is the links to the pic's.
    <a target="_blank" href=http://www.imagestation.com/album/?id=4292465889>http://www.imagestation.com/album/?id=4292465889</a>

    <font color=green>BobK<font color=green>
     
  18. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    I have a similar setup as BobK. I have 2- 14" (pullers) electric fans mounted on an aluminum angle iron frame. To attach it they have those zip tie type things that go through the radiator for tranny coolers or fans.
    I never have problems with the engine heating up on me.

    One thing I might add, is I've replaced the relay two or three times where I had it in the engine compartment because it was getting too hot and would melt. About the 3rd time I wired the relay under the dash near the fuse box, and haven't had a problem since.
     
  19. DesertDueler

    DesertDueler 1/2 ton status

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    Thats fine if thats your opinion, but I tried two pera-crap fans on it and it overheated all the time, along with everyone at the shop I work with. Everyone went back to a clutch fan, except me I tried the t-bird fan because I was amazed at how much air the pull while we had one sitting in the shop idleing. Since then two other guys switched over and had no problems. Most of the cars at work though are pushing over 500 hp.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  20. SKI-'84K5

    SKI-'84K5 1/2 ton status

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    Friz, if you switch over to electric fans how much room does that free up for a body lift and dropping the t-case since you don't have to worry about your fan eating your rad.
     

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